FREE RADICAL POLYMERISATION PROCESS FOR MICROGEL PREPARATION

摘要

This invention relates to a process for preparation of a microgel comprising polymerising a monomer composition comprising a monounsaturated monomer and a multiunsaturated crosslinking monomer as a solution in an organic solvent, by free radical solution polymerisation wherein the reactivity ratio of the monounsaturated monomer is significantly different from the multiunsaturated monomer and the concentration of the monomer component and the proportion of crosslinking monomer in said monomer composition is controlled to provide a solution of discrete microgel particles of number average molecular weight of at least 10SUP5/SUP